synchronous belt pulley (XL,L,H,XH,XXH) HTP Timing pulleys(3M,5M, ... Timing pulleys (T2.5,T5,T10,T20,AT5,AT10),et synchronous belt pulley (XL,L,H,XH,XXH) HTP Timing pulleys(3M,5M ... Timing pulleys(L,H,XH)The surface treatment of timing belt pulleys is black phophated(except alluminiummaterial),iron should be dynamically ...